Please Remember:
New circuits are updated regularly and listed in date order on the update page. If you have problems try my help page and remember that most circuits on this site use SI Notation. Due to the volume of email that I receive each day, I regret that I can only answer questions about circuits featured on my site. You may find the Circuit Index useful.

For help or to submit a circuit please email me

1. Gyrator Circuit
2. L200 PSU
3. 12 Volt 30amp Supply
4. Regulated 12 Volt Supply by Mick Devine
5. Fuse Blown Indicator
6. Unregulated Power Supply
7. Dual Regulated Power Supply
8. Boosting Regulator Current
9. Logic PSU with Over Voltage Protection
10. Nicad Battery Charger
11. PIC Nicad Battery Charger External link to Peter Hayles Site
12. Variable Power Supply
13. Transformerless Power Supply by Ron J
14. Universal DC-DC Converter
15. Variable Regulator Output by Ron J
16. LM317 Regulator Circuit by Matthew Hewson
17. Basic UPS
18. Over Voltage Protection for LM317
19. Alarm PSU by Ron J
20. An Output Adjustable Flyback Converter by Simon Oh
21. A 13.8V 20A PSU by Bob
22. A 9V 2A PSU
23. Current Limiting Power Supply by Ron J
24. Supply Voltage Indicator by Miroslav Adzic
25. Small Variable Power Supply by Miroslav Adzic
26. Soft Start power Supply by Miroslav Adzic
27. Universal PSU By Volker Jeschkeit
28. Add-On Current Limiter by Ron J
29. 1.3V Power Supply
30. Variable Power supply by David Celestin
31. Fast Electronic Fuse by Miroslav Adzic
32. Adjustable Power Supply with Charger by Milardo de Guzman
33. Multiple Output DC Converter
34. 12 Volt 20 Amp Power Supply
35. Power Fail Alert
36. Power Zener Circuit
37. Variable 37 Volt 30 Amp Supply by Max
38. RF Friendly PSU
39. EMI Mains Filter
40. Under Voltage Circuit